11.  Human machines everywhere are built up from mechanisms involving combinations of motion in a straight line and motion in a circle.

12.  If the paddler builds up speed and then stops paddling, the boat will drift on in a straight line.

13.  It is a closely-packed map with hardly a straight line or an empty space in it.

14.  Light always travels in a straight line.

15.  Light travels in a straight line.

16.  Now the right leg is thrust out with the foot travelling in a straight line towards the opponent.

17.  Once this fall was likened to a gigantic weir, its crest a straight line between Goat Island and the opposite shore.

18.  Our screwed up eyes imagined they say a straight line in the bottom of Central Gully.

19.  Perfect log-normal grain size distributions plot as straight lines on the probability paper.

20.  The almond trees grow in the fertile valleys of California, neatly planted in straight lines.